Smoke detector



FIG. 1 is a right-side perspective view of a smoke detector showing my new design;

FIG. 2 is a left-side elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a bottom plan view;

FIG. 5 is a top plan view; and

FIG. 6 is a sectional view taken along any one of the lines 6--6 in FIG. 4. 

The ornamental design for a smoke detector, as shown and described. 